Projecting apparatus



April 27 1926.

J. KAMlDE ET AL PROJEGTING APPARATUS Filed Sept. 5,

Patented Apr. 27, 1926. i

UNITED STATES PATENT OFFICE.

JUTARO KAMIDE AND TOSHIMASA IMASHIRO, 0F KOBE, JAPAN, ASSIGNOBS TO GOSHI KAISHA SANKOSHA, OF KOBE, JAPAN, A CORPORATION OF JAPAN.

PROJECTING APPARATUS.

Application filed September 5, 1923. Serial No. 661,005.

To all whom it may concern:

Be it known that we, JUTARO KAMmn, a subject of Emperor of Japan, and a resident of Daikai-Dori, Kobe, Empire of J apan, and Tosnmmsn hmsnmo, a subject of the Emperor of Japan, and a resident of Kamitachidori, Kobe, Empire of Japan, have jointly invented a new and useful lmprovelncnt in Projecting Apparatus, of which the following is a specification.

This invention relates to an apparatus for use in projecting images on a screen so as to be clearly visible in the daylight or in the presence of artificial light, and 00111- p iscs a housing or casing forming a dark chamber, which is provided with spaced double screens at the front end and an opening in the rear end wall, the object of the invention being to provide an apparatus by r means of which photographed objects projected on a screen'will have a maximum distinctness of outline and clearness even in the presence of outside light of considerable intensity.

An apparatus embodying the invention is illustrated in the accompanying drawings, in which Figure l is a longitudinal section of the apparatus. Figure 2 is a plan view. Figure 3 is a front elevation partly broken away. Fig. 4 is a front elevation illustrating diagrammatically the ground surface at one side of the screen; and Fig. 5 is a similar view illustrating the opposite side, the full lines in each of Figs. 4 and 5 representing the grinding on one surface,'whiletl'1e dotted lines represent that on the opposite surface.

In the illustrated apparatus a projecting house or casing A is provided, said casing being of rectangular shape and forming a dark chamber. At the front end of the casing A, a double screen is provided which comprises an outer screen 9 and an inner screen 72. spaced apart about one or two feet. The distance between the screens may be regulated according to the strength of light striking the outer surface of the outer screen.

The outer screen 9 is made of transparent celluloid the reflectivity of which is reduced to a minimum by applying a gray color thereto, or the screen may be made of a very thin fabric such as gauze or the like impregnated with suitable materials such as oil or Wax to render it sufficiently translucent, so that the said outer screen 9 does not transmit the light from outside the casing A on to the inner screen it but permits images projected on the inner screen n to be clearly seen through it. The inner screen n is made of colorless celluloid rendered semitransparent by grinding one of its surfaces, as 1 (Fig. 4) in a direction at right anglesto the other, as 2 (F ig, 5). The casing A is provided at its rear end with an opening e through which the images are to be projected from the projector e.

The i nages projected on the inner screen 7 made in the manner above described have distinctive outlines due to the grinding of the screen at its opposite sides in directions perpendicular one to the other.

When it is desired to have the images colored on the screen any suitable means may be employed. For example, suitably colored lamps Zare arranged in the recess as shown at y at the top, bottom or sides of the space between the screens n, and G so that the projecting ray will not be intercepted by the lamp and the inner screen at will be uniformly lighted by a reflector of the colored lamp.

This invention is based on the fact that we have found by experiment that, when ordinary thin transparent celluloid screen is lightly ground in direotions'perpendicular to each other at its opposite surfaces in order to render the same semitransparent, the projected images will show most excellent contrast of luminosity and the outlines are sharply defined, while when the screen ishighly transparent by grinding in irregular directions on its opposite surfaces the projected images can not be seen at the front of the screen, and the outlines are distorted. Moreover, when the screen is ground only on its front surface it permits the light outside thereof to penetrate therethrough into I the dark chamber. On the other hand, when the screen is ground only on its rear sllirface the projected images will not be very c ear.

It is obvious, that when the inner screen is ground as herein described, the images are simultaneously projected on each face, but on account of the fact that the screen is very thin andthat the spectators'are at a distance of about ten or more feet from the screen, the projected images can be clearly seen without showing any undesirable shade.

With apparatus as heretofore employed, When a lamp of small candle power is placed in front of the screen the projected images will disappear, while with our apparatus even when the screen is lighted from a light source of considerable candle power, the projected images do not disappear and accordingly the color scheme is efi'ected by means of colored lamps Without the necessity of coloring the film.

Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, we declare that what we claim is:

A projecting apparatus, comprising a casing forming 'a dark chamber having an opening in one end wall adapted to register with a projector, a pair 01' screens closing the other end of said dark chamber, the inner screen of said pair having its surfaces ground in directions perpendicular to each other to a condition of semitransparency and the outer screen being made transparent but with minimum reflectivity.

In testimony whereof, We have signed our names to this specification this 1st day of August, 1923.

' JUTARO KAMIDE.

TOSHIMASA IMASHIRO. 

